How can planes intersect?
1 Answer
Jul 2, 2018
Two planes (in

Not at all  if they are parallel.

In a line.

In a plane  if they are coincident.
Explanation:
In

If one plane is identical to the other except translated by some vector not in the plane, then the two planes do not intersect  they are parallel.

If the two planes coincide, then they intersect in a plane.

If neither of the above cases hold, then the planes will intersect in a line.
Note that two planes cannot intersect in one or a finite number of points.